CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 15,432	$ 10,555	$ 37,217	$ 27,149
Other comprehensive loss:
Foreign currency translation losses	(5,873)	(2,520)	(6,760)	(212)
Net unrealized losses on marketable securities	(269)	(32)	(137)	(16)
Other comprehensive loss	(6,142)	(2,552)	(6,897)	(228)
Comprehensive income	$ 9,290	$ 8,003	$ 30,320	$ 26,921